1) a woman's bush begrudgingly offered, knowing that she will be able to use the favor to her advantage at a later time; i.e., a crabby female who allows playing in her pubic grass now as a sacifice for a later advantage
2) a woman's pubes loaded with crabs
Damn I was horny, but the ole lady was in a pissy mood so I refused the crab grass knowing that if I played today, I would be paying tomorrow.
A stank ho's patch of pubic hair. Referring to the probable existence of "crabs" or pubic lice (Pthirus pubis) residing therein.
Man, I was rollin' in that bitch's crab grass last week and got eat-up with those little fuckers.